Distech Controls BACnet MS/TP Hardware Installation Manual page 2

Figure 5-1: Device Dimensions
6. Device Wiring
The repeater has physical connections for up to five (3) different
connections. These connections include the following:

Power (+10 VDC to +30 VDC non-isolated)

Data input

Data output 1
Wiring
Figure 6-1: Device connections
A repeater can be added anywhere to a data bus as shown below.
Typical BACnet Device Repeater
120 Ω
Data Bus: Shielded Twisted Pair Cable
The shield of the data bus must be connected to the electrical system
ground at one point only – usually at the Building Controller, when present
Figure 6-2: Using a repeater to extend the range of the LAN
Do not use more than two (2) repeaters on a BACnet MS/TP data
bus.
A repeater is counted as a device on each data bus on which it is
connected.
Make sure the shield is connected to the electrical system ground at
one point on the channel. The shield coming into the repeater and
out of the repeater should be twisted together and isolated with
electrical tape.
When third party devices are connected to the data bus, the number
of devices that can be connected may be reduced. Refer to section
"Maximum Number of BACnet MS/TP Devices on a Data Bus
Segment" in the BACnet Network Guide for more information.
7. LED Indicator
The LED embedded in the repeater represents the following
information:
Red: When power is connected the LED will be a solid red
color.
Orange: When data is being transmitted (sending and receiving)
the LED will flash orange.
Typical BACnet Device
Data Bus Shields: Twist
together and Isolate
with electrical tape
120 Ω
Distech Controls, Inc.
Toll-free: 1-800-404-0043
Tel. International: 450-444-9898
www.distech-controls.com
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